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Hi I'm gonna try to help you out. If you take a look inside the furnace where the controls are, is there a flat fuse either on the board or in line with the transformer? Do you have a volt meter to make a couple checks? Thanks
OK. Let me know. If no fuse is present I will help walk you through with checking the transformer and board. It is very plausible changing a thermostat while the system is hot would cause this. I've done this myself. Normally there is a fuse in the the control circuit of most furnaces. I can get you a manual if you provide me with your exact model number. Thanks.